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Prestressed Bolts in a Tube Connection

A tube connection consisting of a flange with eight prestressed bolts is subjected to a set of loads made up of an internal pressure, axial force, and external bending moment.

The model domain consists of 1/4 of the full geometry, since there are two planes of symmetry.

The study consists of two steps: prestressing the bolts and studying how the stress state in the tube and the bolts varies with the applied external load.

Both the given pretension force and the computed bolt forces of the cut bolts in the symmetry plane are automatically interpreted as if it were a full bolt, thus simplifying the modeling workflow.

A number of stress classification lines are then created, along which a stress linearization evaluation is performed. Stress linearization is a postprocessing technique where the stresses through a thin section in a solid model are represented by a constant membrane stress field and a linearly varying bending stress field. Membrane, bending, and peak stresses are reported and stress intensities are computed for each such stress classification line.

The combination of COMSOL® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Specification Chart and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.